638 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



Adult flies are trapped in a great number of different kinds of 

 traps. The principles of construction and operation are so familar 



FIG. 549. Hodge type window trap. At left trap with end removed to show 

 construction. At right, cross section 6f trap placed in window. A. End 

 of trap; B, upper side of folds in screen; C, lower side of folds in screen; 



D, portion of end of trap sawed out and returned after attaching screen; 



E, holes along apex of folds; F, door for removing dead flies; G, window 

 sill; H, upper window sash; 7, inside entrance for flies; O, outside entrance 

 for flies. (After Bishopp, U. S. Dept. of Agr.) v 



as not to need description. 

 One is pictured below for 

 use in windows of dwellings 

 and stables, and others for 

 different situations. 



Trapping of maggots is 

 based upon the habit of mi- 

 grating from the feeding 

 place just before pupating. 

 Practical traps are designed 

 rather to capture the larvae 

 breeding in manure than 

 elsewhere since manure is 



r.-rt m f r. ^^ -.i. TT j the only breeding material 

 FIG. 550. Top of garbage can with Hodge J 



trap attached. (After Bishopp, U. S. Dept. that can not, and should 

 of As r -) not, be immediately de- 



stroyed. The construction is simple. A shallow pit is dug and 

 lined with cement so that it will hold water. Over this, about a 



